He values his private life.

He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.

He holds a personal grudge against me.

Using the private railway makes commuting very convenient.

This number is called Fuka-soku Fuka-soku-ten, and it's almost impossible to comprehend its magnitude.

He is writing a thesis on abiogenesis.

He is writing a thesis on the octovocalic theory.

The heliocentric theory is the idea that the sun, not the earth, is the center of the universe.

He believes in the geocentric theory.